Question

Which of the following contributed greatly to the fall of the Song Dynasty?

a. the invention of gunpowder
b. the increase in the Chinese population
c. the improvement of the civil service system
d. the vulnerability to invaders from the north

Answer 1

D. the vulnerablitliy to invaders from the north. (just took the test)

Answer 2

It was primarily "d. the vulnerability to invaders from the north", since the Mongol territory was rapidly expanding--making the Mongol warriors all the more powerful.